Journal: Physics and Imaging in Radiation Oncology

Article Title: Determination of acceptance criteria for geometric accuracy of magnetic resonance imaging scanners used in radiotherapy planning

doi: 10.1016/j.phro.2021.01.003

Figure Lengend Snippet: A spatial map of the geometric distortion on top of the phantom image in a) axial, b) coronal, and c) sagittal slices for the clinical acquisition of Scanner A. The slice intersections are indicated with red, yellow, and green lines. (For interpretation of the references to colour in this figure legend, the reader is referred to the web version of this article.)

Article Snippet: Using the marker position information and a home-written MATLAB-code (R2019a, The MathWorks Inc., Natick, MA, US), the distortion magnitudes were determined in spherical volumes around the scanner isocenter with different diameters of the spherical volume (DSV), as well as in cylindrical volumes of interest (VOI) of different lengths along the z -axis (i.e. along the direction of the scanner bore; see ).

Techniques:

Journal: Physics and Imaging in Radiation Oncology

Article Title: Determination of acceptance criteria for geometric accuracy of magnetic resonance imaging scanners used in radiotherapy planning

doi: 10.1016/j.phro.2021.01.003

Figure Lengend Snippet: The distortion magnitude distribution at different diameters of spherical volumes around isocenter for each sequence and scanner. The dots mark the means and the lines mark the medians. The boxes define 25th and 75th quantiles, and red crosses are maximum outliers. Dashed gray line indicates distortion magnitude level of 1 mm. Scanners A-C are 1.5 T and D-E 3 T. The maximum value (16.0 mm) of 2D FSE sequence is not visible for Scanner C.

Article Snippet: Using the marker position information and a home-written MATLAB-code (R2019a, The MathWorks Inc., Natick, MA, US), the distortion magnitudes were determined in spherical volumes around the scanner isocenter with different diameters of the spherical volume (DSV), as well as in cylindrical volumes of interest (VOI) of different lengths along the z -axis (i.e. along the direction of the scanner bore; see ).

Techniques: Sequencing

Journal: Physics and Imaging in Radiation Oncology

Article Title: Determination of acceptance criteria for geometric accuracy of magnetic resonance imaging scanners used in radiotherapy planning

doi: 10.1016/j.phro.2021.01.003

Figure Lengend Snippet: Distortion magnitude distortion versus length of volume-of-interest along z-axis. The dots mark the means and the lines mark the medians. The boxes define 25th and 75th quantiles, and red crosses are maximum outliers, of which values >10 mm are omitted for visualization purposes, but are given as text. Dashed gray line indicates distortion magnitude level of 1 mm. Scanners A-C are 1.5 T and D-E 3 T. The whisker of 2D FSE sequence ends at 11.0 mm for Scanner C.

Article Snippet: Using the marker position information and a home-written MATLAB-code (R2019a, The MathWorks Inc., Natick, MA, US), the distortion magnitudes were determined in spherical volumes around the scanner isocenter with different diameters of the spherical volume (DSV), as well as in cylindrical volumes of interest (VOI) of different lengths along the z -axis (i.e. along the direction of the scanner bore; see ).

Techniques: Whisker Assay, Sequencing

Journal: Physics and Imaging in Radiation Oncology

Article Title: Determination of acceptance criteria for geometric accuracy of magnetic resonance imaging scanners used in radiotherapy planning

doi: 10.1016/j.phro.2021.01.003

Figure Lengend Snippet: One standard deviation (1SD) of the marker-by-marker distortion magnitude for single-and repeated-setups versus marker’s radial distance (left) and distance along z-axis (right) from the scanner isocenter.

Article Snippet: Using the marker position information and a home-written MATLAB-code (R2019a, The MathWorks Inc., Natick, MA, US), the distortion magnitudes were determined in spherical volumes around the scanner isocenter with different diameters of the spherical volume (DSV), as well as in cylindrical volumes of interest (VOI) of different lengths along the z -axis (i.e. along the direction of the scanner bore; see ).

Techniques: Standard Deviation, Marker

Journal: Physics and Imaging in Radiation Oncology

Article Title: Determination of acceptance criteria for geometric accuracy of magnetic resonance imaging scanners used in radiotherapy planning

doi: 10.1016/j.phro.2021.01.003

Figure Lengend Snippet: Acceptance criteria recommendations of the geometric distortion for MRI-scanners used in radiotherapy planning: external radiotherapy to conventional target volumes (MRI-CT-coregistration and MRI-only) versus diameter of spherical volumes (DSV); external stereotactical radiosurgery to small targets according to the size of the planning target volume (PTV); and internal radiotherapy (i.e. brachytherapy).

Article Snippet: Using the marker position information and a home-written MATLAB-code (R2019a, The MathWorks Inc., Natick, MA, US), the distortion magnitudes were determined in spherical volumes around the scanner isocenter with different diameters of the spherical volume (DSV), as well as in cylindrical volumes of interest (VOI) of different lengths along the z -axis (i.e. along the direction of the scanner bore; see ).

Techniques: